What's the history behind Pavagadh Temple Chunari given by Modi's mother to PM Modi

What's the history behind Pavagadh Temple Chunari given by Modi's mother to PM Modi . The third phase voting of the Lok Sabha election is over. Prime Minister Narendra Modi also voted in Gujarat. However before this, PM Modi visited his native residence Gandhinagar and met Mother Hiraben. Mother gave her the blessings of being victorious in the elections. At the same time, she gave Pavagadh Chunari to Modi,